crea una calculadora cientifica que pueda hacer calculos dificiles

buildoutcfg
<table>
<tr>
<td colspan="4">Calculadora Cientifica</td>
</tr>
<tr>
<td colspan="4">
<input type="text" id="result">
</td>
</tr>
<tr>
<td><input type="button" class="button" value="7"></td>
<td><input type="button" class="button" value="8"></td>
<td><input type="button" class="button" value="9"></td>
<td><input type="button" class="button" value="/"></td>
</tr>
<tr>
<td><input type="button" class="button" value="4"></td>
<td><input type="button" class="button" value="5"></td>
<td><input type="button" class="button" value="6"></td>
<td><input type="button" class="button" value="*"></td>
</tr>
<tr>
<td><input type="button" class="button